If this printer is near the router, just turn off its WiFi and connect it via LAN cable. The printer will still be available for wireless clients in your LAN.

Ah OK. These don't come in single unit packages. The 8010P does - and I'd prefer the 8000 series over the 9000 anyway, purely for product maturity.

Two WiFi PAs would be rather pointless. Typically, what you buy these for is so you can have a 2nd WiFi access point away from your main router. So the simple PLC goes where your router is, and the...

Save your money. All the wires in your house are unshielded. Everything has an electromagnetic emission. So unless you go full Amish, your house will never be "clean". Again: By all science, it's...

What's a 2000er?

Use the device's browser interface. Type in its IP address and go from there. If unsure, your router should be able to list you what IP address has been assigned to the TL-WPA.